A member asked:

How come some people develop polymastia (more than two breast)?

4 doctors weighed in across 3 answers

Evolution: This is probably a remnant of a dormant gene related to the evolution of our species, if you believe in that. Other mammals have the so called "milk line" and it also briefly appears in fetuses during the seventh week of development. It is a thickening if the skin that extends from the axilla (armpit) to the groin. Billets and breast tissue may appear anywhere along this line.

Answered 12/9/2013

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Congenital: There is a mammary line and breast tissue can develop along that line in girls as they are developing.

Answered 8/15/2012

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Dr. Timothy Mountcastle answered

Specializes in Plastic Surgery

Nipples: Supra numary nipples are more common. ( extra nipples). I've never heard of polymastia.

Answered 7/23/2012

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